I completely understand what you say Im color blind it makes a lot of sense. I had to do a similar project for an art class, and it's more about how correct they want to be. if I chose the colors by name and context in the image it would be easy, but i can kind of let this happen if I don't focus so much on distinguishing between colors.

Well all of this depends on your play style, do you like having exclusive items and starting over again every month or do you prefer having the same characters and progressing steadily. Seasons do end though but there is no concrete length to them. Seasonal characters turn into "normal" ones after every season. In the end it's really up to your play style